If you're an "accidental American" (holding US citizenship due to having being born in the US, though never having resided there as an adult) in a French-speaki

If you're an "accidental American" (holding US citizenship due to having being born in the US, though never having resided there as an adult) in a French-speaking European country, you may be interested in the "accidental Americans" association https://www.americains-accidentels.fr/ They organize various legal challenges concerning the consequences of FATCA legislation for EU citizens (in particular, difficulties in having a bank account) and the principle of extra-territorial taxation, as well as challenging the difficulty and unreasonable cost of renouncing US citizenship.